Improved catalytic activity of mixed platinum catalysts supported on various carbon nanomaterials

JOURNAL OF POWER SOURCES

卷:267

Article

Zhang, Jie^1,2,3  Tang, Shuihua^1,2  Liao, Longyu³  Yu, Weifei³  Li, Jinshan³  Seland, Frode⁴  Haarberg, Geir Martin⁴ 

[1] Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Sichuan, Peoples R China

[2] Southwest Petr Univ, Sch Mat & Engn, Chengdu 610500, Sichuan, Peoples R China

[3] China Acad Engn Phys, Inst Chem Mat, Mianyang City 621900, Sichuan, Peoples R China

[4] Norwegian Univ Sci & Technol, Dept Mat Sci & Engn, N-7491 Trondheim, Norway

关键词: Coiled carbon nanotubes;    Carbon nanotubes;    Oxygen reduction reaction;    Catalytic activity;    Proton exchange membrane fuel cells;   

DOI  :  10.1016/j.jpowsour.2014.05.137

来源: Elsevier

【 摘 要 】

Electrocatalyst support affects not only catalytic activity of a catalyst, but also mass transportation and electron transfer in the catalyst layers of an electrode for proton exchange membrane fuel cells. Multidimensional and combined carbon materials such as Vulcan XC-72, carbon nanotubes (CNTs), and home-made coiled carbon nanotubes (CCNTs) are applied to enhance the catalyst activity and utilization. Three-dimensional CCNTs with large specific surface area and graphitic characteristic are synthesized by solid-state catalytic method. This obtained CCNTs and commercial CNTs are used as support to prepare platinum catalysts via modified ethylene glycol method, respectively. And the electrochemical surface areas (ECSAs) of the as-prepared Pt/CNTs, Pt/CCNTs and commercial Pt/C (JM) catalyst are evaluated by cyclic voltammetry. Then each two and three kinds of above catalysts mixed with different mass ratios are investigated. The ECSAs of Pt/C Pt/CCNTs (95:5) and Pt/C Pt/CNTs Pt/CCNTs (80:10:10) are calculated to be 106 m(2) g(Pt)(-1) and 111 m(2) g(Pt)(-1), with respect to 70 m(2) g(Pt)(-1) of Pt/C (JM) catalyst. And these mixed catalysts also demonstrate improved oxygen reduction reaction activities. This is mainly attributed to the unique structure of CCNTs, which can construct a multi-dimensional network to facilitate the mass transportation and electrons/protons transfer. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free